Support to pass <uses-library> option through to dex2oat.

This change takes an app's shared libraries specified by <uses-library>
and passes it through to dex2oat to be used during compilation.

Part of a multi-project change.

Bug: 26880306

(cherry-picked from commit 26e8a2f150cd7f7195a10650ab8a5b6fa5014bc8)

Change-Id: I72a352abdfc37eacd8bedfa6c218e3809ca8e39c
diff --git a/runtime/oat_file_assistant.cc b/runtime/oat_file_assistant.cc
index 713e2f3..fba10ca 100644
--- a/runtime/oat_file_assistant.cc
+++ b/runtime/oat_file_assistant.cc
@@ -771,7 +771,11 @@
   argv.push_back("--runtime-arg");
   argv.push_back("-classpath");
   argv.push_back("--runtime-arg");
-  argv.push_back(runtime->GetClassPathString());
+  std::string class_path = runtime->GetClassPathString();
+  if (class_path == "") {
+    class_path = OatFile::kSpecialSharedLibrary;
+  }
+  argv.push_back(class_path);
   if (runtime->IsDebuggable()) {
     argv.push_back("--debuggable");
   }